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  1. %{
  2.   #include<stdio.h>
  3. %}
  4. %%
  5. "if"{printf("IF");}
  6. "else"{printf("ELSE");}
  7. "then"{printf("THEN");}
  8. "while"{printf("WHILE");}
  9. "<"|">"{printf("RELOP");}
  10. [a-zA-Z][a-z|0-9]*{printf("identifier");}
  11. "("|")"{printf("Bracket");}
  12. [0-9]*{printf("NUM");}
  13. %%
  14. int yywrap()
  15. {
  16.   return 1;
  17. }
  18. main(){
  19.   printf("enter your string: ");
  20.   yylex();
  21. }
Success #stdin #stdout #stderr 0.02s 6868KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
ERROR: /home/f3SXxH/prog:21:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/ao1Jjd
language:
Prolog (swi 7.6.4)
created:
16 days ago
visibility:
public

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